<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>           
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
            <div id="main" style="width: 750px;height:400px;"></div>
        </el-card>
    </div>
</template>
<script>
//1.导入 echarts 
// import echarts from 'echarts'
import * as echarts from 'echarts'
import _ from 'lodash'

export default {
    data() {
        return {
                    //需要合并的数据
        options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
        }
    },
    created() {

    },
    //(只要执行到这个函数，dom元素初始化好了)此时，页面上的元素，已经被渲染完毕了！
    async mounted() {
        // let echarts = require('echarts')
        // 3.基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))

        const {data: res} = await this.$http.get('reports/type/1')
        if(res.meta.status !== 200) {
            return this.$message.error('获取折线图数据失败！')
        }
        

        //4.准备数据和配置项
      const result =  _.merge(res.data, this.options)

        //5.展示数据
        myChart.setOption(result);
        
    },
    methods: {

    }
}
</script>
<style lang="less" scoped>
    
</style>